mgr/cephadm: add container digests of mgr that deployed daemon to unit.meta

For use in upgrade. It's useful to see if daemon was deployed by mgr running
same container digest as container we are upgrading to.

Signed-off-by: Adam King <adking@redhat.com>

src/pybind/mgr/cephadm/module.py

@@ -1757,6 +1757,11 @@ class CephadmOrchestrator(orchestrator.Orchestrator, MgrModule,
     def daemon_is_self(self, daemon_type: str, daemon_id: str) -> bool:
         return daemon_type == 'mgr' and daemon_id == self.get_mgr_id()
 
+    def get_active_mgr_digests(self) -> List[str]:
+        digests = self.mgr_service.get_active_daemon(
+            self.cache.get_daemons_by_type('mgr')).container_image_digests
+        return digests if digests else []
+
     def _schedule_daemon_action(self, daemon_name: str, action: str) -> str:
         dd = self.cache.get_daemon(daemon_name)
         assert dd.daemon_type is not None

src/pybind/mgr/cephadm/serve.py

@@ -279,6 +279,7 @@ class CephadmServe:
             sd.memory_request = d.get('memory_request')
             sd.memory_limit = d.get('memory_limit')
             sd._service_name = d.get('service_name')
+            sd.deployed_by = d.get('deployed_by')
             sd.version = d.get('version')
             sd.ports = d.get('ports')
             sd.ip = d.get('ip')
@@ -880,6 +881,7 @@ class CephadmServe:
                             'service_name': daemon_spec.service_name,
                             'ports': daemon_spec.ports,
                             'ip': daemon_spec.ip,
+                            'deployed_by': self.mgr.get_active_mgr_digests(),
                         }),
                         '--config-json', '-',
                     ] + daemon_spec.extra_args,

src/pybind/mgr/cephadm/tests/test_cephadm.py

@@ -289,7 +289,7 @@ class TestCephadm(object):
                 _run_cephadm.assert_called_with(
                     'test', 'mon.test', 'deploy', [
                         '--name', 'mon.test',
-                        '--meta-json', '{"service_name": "mon", "ports": [], "ip": null}',
+                        '--meta-json', '{"service_name": "mon", "ports": [], "ip": null, "deployed_by": []}',
                         '--config-json', '-',
                         '--reconfig',
                     ],

src/pybind/mgr/orchestrator/_interface.py

@@ -793,6 +793,7 @@ class DaemonDescription(object):
                  service_name: Optional[str] = None,
                  ports: Optional[List[int]] = None,
                  ip: Optional[str] = None,
+                 deployed_by: Optional[List[str]] = None,
                  ) -> None:
 
         # Host is at the same granularity as InventoryHost
@@ -847,6 +848,8 @@ class DaemonDescription(object):
 
         self.ports: Optional[List[int]] = ports
         self.ip: Optional[str] = ip
+        
+        self.deployed_by = deployed_by
 
         self.is_active = is_active